AspNetSessionValueLayoutRenderer should be threadsafe

[snakefoot]

AspNetSessionValueLayoutRenderer modifies the HttpContext.Items-collection, but this collection is not threadsafe.

Implement other threadsafe way of doing re-entrant checking. Ex. like this: getsentry/sentry-dotnet@e0d6b1d (Only possible for ASP_NET_CORE or NET46)

[snakefoot]

@bakgerman Maybe something for you ?

[bakgerman]

Yes, I accept :)

[bakgerman]

I have read the commit above and I now understand the AsyncLocal technique used.
it should be relatively easy to address this.
We can keep the old code maybe for NET35 platform.

[snakefoot]

Sounds good to me.

[bakgerman]

PR submitted